Luxcore to Demo Optical Switch Advance

Luxcore Networks Inc. is planning to demonstrate a significant development in all-optical switches at the Optical Fiber Communications (OFC) Conference in Anaheim, Calif., next week.

The startup will show a working prototype switch incorporating optical rather than electrical wavelength conversion -- a development that could help carriers slash costs considerably.

Understanding this can be a little tricky, but the argument goes like this:

First-generation, all-optical switches are fairly limited in what they can do. In their simplest form, they act like automated patch-panels, steering all the light from one fiber into another.

In their more sophisticated form, they're integrated with DWDM (dense wavelength-division multiplexing) systems so that light is split into different wavelengths before it’s switched. In this case, the wavelengths coming out of one fiber can be routed into different fibers.

The big catch, however, is that the switch can’t change the wavelength of the light without converting it into electrical signals and retransmitting it -- and this OEO malarkey is exactly what all-optical switches are supposed to eliminate.

Optical wavelength conversion promises to avoid this snag, but that’s only for starters.

Being able to shift light from one wavelength to another can be used to sidestep problems associated with one stream of signals blocking the path of another stream within a switch, according to Gerald Ramdeen, Luxcore’s CEO and CTO. As a result, the same capacity switch needs significantly less switching fabric if optical wavelength conversion is employed, he says. That equates to "less power, less space, less cost -- and that's exactly what customers want."

Luxcore’s way of doing optical wavelength conversion also appears to give its switch another plus. Light signals get a boost of power as they pass through. Ramdeen is cagey about giving details. “We’re using tunable lasers as a programmable pump source,” he says, adding, “We’re doing frequency mixing without all the nasty side effects.”

Our reading of this is that Luxcore’s using semiconductor optical amplifiers (SOAs). The tunable laser pumps different wavelengths of light into the SOA to change the wavelength of the light carrying the actual data.

Now for some details. Luxcore’s switch, called the LambdaXchange, will come in two sizes. The first one will have eight input fibers and eight output fibers and a capacity of 20 terabit/s. The second one will have 16 input fibers and 16 output fibers and a capacity of 120 terabit/s. Both models will incorporate some state-of-the-art DWDM technology: 240 channels, 80 in the C band, 80 in the L band, and 80 in the S band.

The switch is formed from two subsystems. The first one incorporates wavelength multiplexers and wavelength converters, which also amplify light signals, as already noted. This subsystem also incorporates some unspecified components that reshape signals optically.

The first subsystem marshals the different streams of light from the carrier’s fiber infrastructure and feeds them into the second subsystem, the switching fabric. Right now, Luxcore is using MEMS (micro-electro-mechanical system) switching fabric, although Ramdeen points out that his switch “wasn’t engineered around MEMs." It would be straightforward to replace the subsystem with something else, if it seemed appropriate.

Luxcore’s demo at OFC will be of a smaller switch, with just two input and two output fibers. It will support 40 wavelengths per fiber. The startup plans to demonstrate wavelength routing, optical wavelength conversion, add-drop functions, and broadcast functions, according to Ramdeen. “We hope this is going to be the first example of optical wavelength conversion,” he says. “We’ll know on Monday whether it really is."

Luxcore expects to start shipping commercial versions of its switch in the fourth quarter of this year. It has 125 staff. It raised $10 million in series A financing last July (see Luxcore Raises $10m First Round) and is planning to start raising further funding soon. “We purposely delayed our next round until after OFC,” says Ramdeen. Originally, Luxcore was called Synchordia (see Startup Touts "First Optical Router").

-- Peter Heywood, international editor, Light Reading http://www.lightreading.com
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fanfare 12/4/2012 | 8:42:52 PM
re: Luxcore to Demo Optical Switch Advance 'I' said CORV needs OEO for switching? Where did I say that?

Either you misunderstood .. or I wasn't clear.

The article is what is confusing me for the most part. That and the fact that I don't have first hand knowlege re the specifics of optical wavelength conversion.
fanfare 12/4/2012 | 8:42:51 PM
re: Luxcore to Demo Optical Switch Advance Xros switch is oeo (in case you didn't derive that from what I said)
fanfare 12/4/2012 | 8:42:51 PM
re: Luxcore to Demo Optical Switch Advance Sorry I didn't respond to this earlier .. been a bit of a hectic day. I was more interested in getting some clarity on the article (as you know).

Again .. I'm not exactly sure what your question is .. however I can tell you a bit about Optera. Optera is NT's ULH solution purchased around the same time as Xros (around 6.5-7 billion for both) The Xros aquisition was suppose to fill that spot (switch fabric) for NT. I'm pretty sure that Xros does not have any o-o-o tech in the pipeline (at least not based on what information they have released.

To date NT does not have an all optical solution.
optical illusion 12/4/2012 | 8:42:49 PM
re: Luxcore to Demo Optical Switch Advance This seems to be consistent with the story thread.
optical illusion 12/4/2012 | 8:42:49 PM
re: Luxcore to Demo Optical Switch Advance Again, this is something village networks harps on. I am guessing its the ability to reconfigure lambdas on the fly. I have no idea when the intend to deliver.

y2k 12/4/2012 | 8:42:44 PM
re: Luxcore to Demo Optical Switch Advance "Xros switch is oeo (in case you didn't derive that from what I said) -- fanfare"

That's incorrect. The Xros switch is a MEMS all-optical switch or what is often called OOO.

optical illusion 12/4/2012 | 8:42:42 PM
re: Luxcore to Demo Optical Switch Advance It's good to see that Nortel tells us absolutely nothing about the XROS switch on their own website. Forget about SONET restoration, what happens when wavelength Y on segment Z in your optical network goes down?

How fast will the switch restore the path? How does it know what band to switch to? Is it done manually or automatically?

I can't wait to see the slugfest if LR tests ooo switches.

fanfare 12/4/2012 | 8:42:40 PM
re: Luxcore to Demo Optical Switch Advance Sorry ... forgot to finish that about IR.

IR was so vague in it's response .... I didn't get much .. but they did not correct me when I said oeo.
fanfare 12/4/2012 | 8:42:40 PM
re: Luxcore to Demo Optical Switch Advance Where did you get this information? Like I said ... it's been a while since I looked into this but I was sure what I found pointed to oeo. I called IR about it (long time ago ...shortly after LU anounced they were going to release a MEMS product within a yr) to find out more about Xros fabric.

y2k 12/4/2012 | 8:42:38 PM
re: Luxcore to Demo Optical Switch Advance Fanfare:

This is not new information. Nortel acquired Xros exactly one year ago and renamed the product PX which is a MEMS-based all-optical switch. The DX and HDX are OEO switch similar to Ciena's CoreDirector.

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